Checking The Thermostat; Assembling The Thermostat Assembly - Yamaha 2009 YZF-R1 (Y) Service Manual

EAS26450

CHECKING THE THERMOSTAT

1. Check:
• Thermostat "1"
Does not open at 71–85 °C (159.8–185.0
°F) → Replace.
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a. Suspend the thermostat "1" in a container
"2" filled with water.
b. Slowly heat the water "3".
c. Place a thermometer "4" in the water.
d. While stirring the water, observe the ther-
mostat and thermometer's indicated tem-
perature.
A. Fully closed
B. Fully open
TIP
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause seri-
ous overheating or overcooling.
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2. Check:
• Thermostat housing cover "1"
• Thermostat housing "2"
Cracks/damage → Replace.
3. Check:
• Thermostat hoses
• Thermostat bypass hoses
• Water pump bypass hose
• Engine outlet pipe
Cracks/damage → Replace.
EAS26460
ASSEMBLING THE THERMOSTAT ASSEM-
BLY
1. Install:
• Thermostat housing "1"
• Thermostat "2"
• O-ring "3"
• Thermostat housing cover "4"
Thermostat housing cover nut
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
TIP
Install the thermostat with its breather hole "a"
facing up.
6-10
THERMOSTAT
New